Voltage-driver circuit with dynamic slew rate control

摘要

A system for circuit for generating an output signal with a dynamically adjustable slew rate includes a sampler, an envelope detector, an envelope comparison and control circuit, and a voltage-driver circuit that includes output buffers for generating the output signal. The sampler generates a sampled signal indicative of the slew rate of the output signal. The envelope detector generates an envelope detection signal indicative of a peak value of the sampled signal. The envelope comparison and control circuit compares a voltage level of the envelope detection signal with various threshold voltage levels, and generates control signals. The voltage-driver circuit controls the operation states of the output buffers based on the control signals to dynamically adjust the slew rate of the output signal.

主权项

1. A system for adjusting a slew rate of an output signal, the system comprising:
a sampler for receiving the output signal and generating a sampled signal indicative of the slew rate of the output signal; an envelope detector, connected to the sampler, for receiving the sampled signal and generating an envelope detection signal having a voltage level that is indicative of a peak value of a voltage level of the sampled signal; an envelope comparison and control circuit, connected to the envelope detector, for receiving the envelope detection signal, comparing the voltage level of the envelope detection signal with a plurality of threshold voltage levels, and generating a plurality of control signals; and a voltage-driver circuit, connected to the envelope comparison and control circuit, for receiving the plurality of control signals and generating the output signal, wherein the slew rate of the output signal is adjusted based on the plurality of control signals, wherein the sampler includes a differentiation comparator circuit having a non-inverting terminal connected to ground, an inverting terminal connected to the voltage-driver circuit by way of a first capacitor for receiving the output signal, and an output terminal connected to the inverting terminal by way of a feedback resistor for generating the sampled signal.